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	<id>https://companal.subwiki.org/w/index.php?action=history&amp;feed=atom&amp;title=Function_holomorphic_at_a_point</id>
	<title>Function holomorphic at a point - Revision history</title>
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	<updated>2026-05-17T01:18:57Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.41.2</generator>
	<entry>
		<id>https://companal.subwiki.org/w/index.php?title=Function_holomorphic_at_a_point&amp;diff=174&amp;oldid=prev</id>
		<title>Vipul: 2 revisions</title>
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		<updated>2008-05-18T19:12:41Z</updated>

		<summary type="html">&lt;p&gt;2 revisions&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 19:12, 18 May 2008&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-notice&quot; lang=&quot;en&quot;&gt;&lt;div class=&quot;mw-diff-empty&quot;&gt;(No difference)&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
	<entry>
		<id>https://companal.subwiki.org/w/index.php?title=Function_holomorphic_at_a_point&amp;diff=173&amp;oldid=prev</id>
		<title>Vipul at 21:19, 16 April 2008</title>
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		<updated>2008-04-16T21:19:59Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
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				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 21:19, 16 April 2008&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l6&quot;&gt;Line 6:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 6:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Let &amp;lt;math&amp;gt;U&amp;lt;/math&amp;gt; be an open subset (without loss of generality, an open connected subset, i.e. a [[domain]]) in &amp;lt;math&amp;gt;\mathbb{C}&amp;lt;/math&amp;gt;. Let &amp;lt;math&amp;gt;f:U \to \mathbb{C}&amp;lt;/math&amp;gt; be a function, and let &amp;lt;math&amp;gt;z_0 \in U&amp;lt;/math&amp;gt;. We say that &amp;lt;math&amp;gt;f&amp;lt;/math&amp;gt; is &amp;#039;&amp;#039;&amp;#039;holomorphic&amp;#039;&amp;#039;&amp;#039; at &amp;lt;math&amp;gt;z_0&amp;lt;/math&amp;gt; if there exists an open subset &amp;lt;math&amp;gt;V \ni z_0&amp;lt;/math&amp;gt; such that &amp;lt;math&amp;gt;f&amp;lt;/math&amp;gt; is [[function complex-differentiable at a point|complex-differentiable]] for every &amp;lt;math&amp;gt;z \in V&amp;lt;/math&amp;gt;, and further, if the complex differential &amp;lt;math&amp;gt;f&amp;#039;&amp;lt;/math&amp;gt; is a continuous function on &amp;lt;math&amp;gt;V&amp;lt;/math&amp;gt;.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Let &amp;lt;math&amp;gt;U&amp;lt;/math&amp;gt; be an open subset (without loss of generality, an open connected subset, i.e. a [[domain]]) in &amp;lt;math&amp;gt;\mathbb{C}&amp;lt;/math&amp;gt;. Let &amp;lt;math&amp;gt;f:U \to \mathbb{C}&amp;lt;/math&amp;gt; be a function, and let &amp;lt;math&amp;gt;z_0 \in U&amp;lt;/math&amp;gt;. We say that &amp;lt;math&amp;gt;f&amp;lt;/math&amp;gt; is &amp;#039;&amp;#039;&amp;#039;holomorphic&amp;#039;&amp;#039;&amp;#039; at &amp;lt;math&amp;gt;z_0&amp;lt;/math&amp;gt; if there exists an open subset &amp;lt;math&amp;gt;V \ni z_0&amp;lt;/math&amp;gt; such that &amp;lt;math&amp;gt;f&amp;lt;/math&amp;gt; is [[function complex-differentiable at a point|complex-differentiable]] for every &amp;lt;math&amp;gt;z \in V&amp;lt;/math&amp;gt;, and further, if the complex differential &amp;lt;math&amp;gt;f&amp;#039;&amp;lt;/math&amp;gt; is a continuous function on &amp;lt;math&amp;gt;V&amp;lt;/math&amp;gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;It turns out that this is equivalent to a [[function complex-analytic at a point]].&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
	<entry>
		<id>https://companal.subwiki.org/w/index.php?title=Function_holomorphic_at_a_point&amp;diff=172&amp;oldid=prev</id>
		<title>Vipul: New page: {{at-point function property|holomorphic function}}  ==Definition==  ===In one dimension===  Let &lt;math&gt;U&lt;/math&gt; be an open subset (without loss of generality, an open connected subset, i.e...</title>
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		<updated>2008-04-16T21:13:42Z</updated>

		<summary type="html">&lt;p&gt;New page: {{at-point function property|holomorphic function}}  ==Definition==  ===In one dimension===  Let &amp;lt;math&amp;gt;U&amp;lt;/math&amp;gt; be an open subset (without loss of generality, an open connected subset, i.e...&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;{{at-point function property|holomorphic function}}&lt;br /&gt;
&lt;br /&gt;
==Definition==&lt;br /&gt;
&lt;br /&gt;
===In one dimension===&lt;br /&gt;
&lt;br /&gt;
Let &amp;lt;math&amp;gt;U&amp;lt;/math&amp;gt; be an open subset (without loss of generality, an open connected subset, i.e. a [[domain]]) in &amp;lt;math&amp;gt;\mathbb{C}&amp;lt;/math&amp;gt;. Let &amp;lt;math&amp;gt;f:U \to \mathbb{C}&amp;lt;/math&amp;gt; be a function, and let &amp;lt;math&amp;gt;z_0 \in U&amp;lt;/math&amp;gt;. We say that &amp;lt;math&amp;gt;f&amp;lt;/math&amp;gt; is &amp;#039;&amp;#039;&amp;#039;holomorphic&amp;#039;&amp;#039;&amp;#039; at &amp;lt;math&amp;gt;z_0&amp;lt;/math&amp;gt; if there exists an open subset &amp;lt;math&amp;gt;V \ni z_0&amp;lt;/math&amp;gt; such that &amp;lt;math&amp;gt;f&amp;lt;/math&amp;gt; is [[function complex-differentiable at a point|complex-differentiable]] for every &amp;lt;math&amp;gt;z \in V&amp;lt;/math&amp;gt;, and further, if the complex differential &amp;lt;math&amp;gt;f&amp;#039;&amp;lt;/math&amp;gt; is a continuous function on &amp;lt;math&amp;gt;V&amp;lt;/math&amp;gt;.&lt;/div&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
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